diff --git a/src/main/java/com/baidu/fsg/uid/worker/DisposableWorkerIdAssigner.java b/src/main/java/com/baidu/fsg/uid/worker/DisposableWorkerIdAssigner.java
index 26570c9..e17dae8 100644
--- a/src/main/java/com/baidu/fsg/uid/worker/DisposableWorkerIdAssigner.java
+++ b/src/main/java/com/baidu/fsg/uid/worker/DisposableWorkerIdAssigner.java
@@ -53,8 +53,7 @@ public long assignWorkerId() {
         // add worker node for new (ignore the same IP + PORT)
         workerNodeDAO.addWorkerNode(workerNodeEntity);
         LOGGER.info("Add worker node:" + workerNodeEntity);
-
-        return workerNodeEntity.getId();
+        return workerNodeEntity.getId() & ~(-1L << 13);
     }
 
     /**